Form clamp



Nov. 27, 1923 1,475,424

G. B. Bosco FORM CLAMP Filed Feb. 5. 1923 2 Sheets-Sheet 1 Nov. 27, 1923. 1,475,424

a. B. BOSCO Filed Feb. 5. 1923 2 Sheets-Sheet 2 Patented Nov. 27, 1923.

I GEORGE B. 30800, OF CHICAGO, ILLINOIS.

FORM CLAMP.

Application filed February 5, 1923. Serial No. 617,039.

To all whom it may concern:

Be it known that, I, (lnoncn B. Bosoo, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Form Clamps, of which the following is a specification.

This invention relates to clamps and in its principal embodiment, is applied to form clamps for holding together the separable parts of a concrete mold.

The main objects of this invention are to provide improved means for readily drawing together the separable parts of a mold; to provide an improved construction and arrangement of means for holding the parts of the mold together while the concrete is being poured and is setting; to provide holding means of the above character which are readily detachable from the mold so as to permit the latter to be stripped after the concrete has set; and to provide a form clamp of this kind which eliminates the use of screw threads and which is inexpensive to manufacture and simple and effective in operation.

Illustrative embodiments of this invention are shown in the accompanying drawings, wherein Figure 1 is a plan view of a column mold having one form of form clamp applied thereto.

Figure 2 is a transverse section of a girder mold having applied thereto another form of clamp.

Figure 3 is a plan view of a wall mold having applied thereto the form of clamp shown in Figure 2.

Figure 4.- is an enlarged perspective view of a detachable tool used in tightening the clamp.

Figure 5 is an enlarged detail of the clip applied to the I-bca-m also in Figure 2.

Figure (5 is an enlarged perspective view of the holding member or collar shown in Figure 1.

Figure 7 is a plan view of the same.

Figure 8 is a longitudinal section of the same, showing also a part ofthe tie band and detachable tool.

Figure 9 is a side elevation of the wedge used in connection with th collar shown in Figures 6. 7 and 8.

Figure 10 is an enlarged perspective view of the collar used on the clamps shown in Figures 2 and 3.

Figures 10, 11 and 12.

In the construction shown, the form clamps to which this invention is applied, involve the use of a tie element, and a holding member in the form of a collar mounted on the tie element for adjustment longitudinally thereof. Adjustment of the holding members on the tie element is accomplished by means o'f'a detachable tool adapted to grip the tie element at a point beyond the collar for pulling the former relative uf the latter. Improved means 'are also provided for" locking the collars to the tie elements without the use or screw threads.

A illustrated, the form clamp comprises a tie element 1, a holding member or collar 2, and a tool 3 which is detachable so that one such tool may serve a large number of clamps.

In the form shown, the tie element 1 is in the form of a. flexible metal band, the size of which is dependent upon the character of the, mold to which the clamp is applied.

Referring to the drawings, there are shown two types of holding members or collars 2. One type of collar for use with clamp-s applied to column molds is shown in Figures 1, 6, 7 and 8. Another type of collar for use with clamps applied to other forms of molds is shown in Figures 2, 3, 10, 11 and 12.

In the particular embodimept, herein illustrated, the holding member or collar 2 com.- prises a block having a pair of intersecting slots 4 and 5 extending therethrough at substantially right angles to each other. The slot 4 i rectangular in cross section and is arranged to receive the tie band 1, which extends through the holding member. The slot 5 is toriued to provide a key-way For a wedge which is adapted to coact with the tie band for clamping the latter to the collar. The wedge used in connection with the type of collar illustrated in Figures 6, 7 and 8 is shown at 6 in Figure 9, and the wedge used in connection with the other type of collar herein illustrated is shown at 7 in Figure 13. The edges of the slot 5 are arranged so that the edge of the wedge which engages llt the tie band 1 is always disposed in parallel bearing for the tool 3 to permit the tool to be fulcrumed on the collar for pulling the tie band relative to the collar 6.

The type of holding member 2 shown In Figures, 1, 6, 7 and 8 is provided with an extension 10 having an opening 11 formed therein through which extends a transversely disposed pin 12, arranged to permit one end of the metal strap 1 to belaced through the opening 11, as shown in Figure 8, for securing the strap against slipping by the friction of the overlapping parts.

The tool 3 comprises a shank 13 providing a handle, and an enlarged head 14 having its end rounded so as to be adapted to be fulcrumed on the seat 9 of the collars 2. Extending through the head 14 is a pair of intersecting slots 15 and 16 disposed at substantially right angle to each other. The slot 15 is arranged to receive the tie band 1, so as to permit the tool to grip the portion of the band projecting beyond the collar 2, for tightening the column. The slot 16 forms a key-way for the wedge 7, and is formed so as to provide depressions 17 on opposite sides of th slot 15 to permit a buckling of the tie band under the action of. the wedge.

In the embodiments shown in the drawings, the improved form clamps are applied to three different kinds of concrete molds, Viz: a column mold as shown in Figure 1, a

. girder vmold as shown in Figure 2, and a wall mold as shown in Figure 3.

The column mold shown in Figure 1 comprises side sections which a're formed of planks 18 secured together by battens 19 arranged on the outside of the mold and disposed transversely to the planks. In this type of mold, the tie element 1 embraces the form and is held in place on the form by the single type of holding member or collar 2 illustrated in Figures 6, 7 and 8.

The girder mold shown in Figur 2 coinprises the usual sections 20 and battens 21 surrounding the I-beam 22. In this type of mold, the tie bands 1 are arranged so as to become embedded in the concrete. The bottom girder section is supported by a plurality of clamps spaced apart at regular intervals along the beam, and in which the tie bands are bent around the I-beam in U- form. The ends of the tie bands project through slots formed in the battens 21 of the bottom mold sections, and are clamped amaze to the collars 2. In the clamps which are applied to the side sections of the girder mold, the inner ends of the tie bands 1 are secured to the flange of the I-beam by means of U-shaped clips 23, as shown in Figures 2 and 5. Formed in the clip 23 is a slot 24 arranged to receive the end of the tie band, so as to permit the latter to be clamped between th clip and the flange of the beam, as shown in Figure 5. The outer ends of the tie bands in this construction project through the battens 21 of the side sections and are clamped thereto by the collars 2.

The wall mold shown in Figure 3 comprises the usual side sections 25, cross pieces 26, and battens 27 In the clamps applied to this type of mold, the ti bands 1 project through the mold so as to become embedded in the concrete, and the collars2 abut against the outside of the mold.

In operation, the tie band is inserted through the slot 4 of the collar 2, so as to project beyond the seat 9. The tool 3 is placed on the seat 9 as shown in Figures 8 and 12, and the end of the tie band is inserted into the slot 15 of the tool. If the projecting part of the tie band is of sufficient length to permit the extremity thereof to be bent back upon the head 14 of the tool. as shown in Figures 3 and 8, it is not necessary to insert the wedge 7 into the kcyway 16 in order to get a proper grip on the tie band. If the projecting part of the tie band is not of suflicient length to permit it to project through the slot 15, then a wedge may be employed as shown in Figure 12. In tightening the clamps having the type of collar 2 shown in Figures 1 and 8, the tool 3 is rocked in the direction of the arrow 28, and with theother type of collar the tool is rocked in the direction of the arrow 29. lVhen the tie band 1 has been adjusted to the proper position relatiy'e to the collar 2, the wedge is inserted into the key-way 5 so as to clamp the collar to the band. The tool may then be removed for use on other clamps.

Although but certain specific embodiments have been herein shown and described, it will be understood that numerous details of the constructions shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims I claim:

1. Av form clamp comprising a flexible tie element, a collar mounted on said element and adapted for adjustment longitudinally thereof, means for locking said collar to said element, and a detachable tool arranged to grip said tie elementand being adapted to be fulcrumed on said collar for pulling said element relative to said collar.

2. A form clamp comprising a tie element,

a collar mounted on said element and adapted for adjustment longitudinally thereof, means for locking said collar to said element, a detachable tool having a slot formed therein for receiving a part of said element projecting through said collar, and means on said tool arranged to grip said projecting part, said tool being adapted to be fulcrumed on said collar for pulling said element relative to said collar.

3. A form clam comprising a tie element, a collar mounte on said element and adapted for adjustment longitudinally there of, means for locking said collar to said element, a detachable tool having a slot formed therein for receiving a part of said element projecting through said collar, and means coacting with said slot for locking said projecting part to said tool, said tool being adapted to be fulcrumed on said collar for pulling said element relative to said collar.

4. A form clamp comprising a tie element, a collar mounted on said element and adapted for adjustment longitudinally thereof, means for locking said collar to said element, a detachable tool having a slot formed therein for receiving a part of said element projecting through said collar, and a wedge in said slot for clamping-the projecting part of said element to said tool, said tool being adapted to be fulcrumed on said collar for pulling said element relative to said collar.

5. A form clamp comprising a tie element, a collar mounted on said element and adapted for adjustment longitudinally thereof, means for locking said collar to said element, a detachable tool having a pair of intersecting slots formed therein, one of said slots being arranged to receive a part of said element projecting through said collar, and a wedge in the other of said slots for clamping the projecting part of said element to said tool, sa1d tool being adapted to be fulcrumed on said collar for pulling said element relative. to said collar.

6. A form clamp comprising a flexible tie element, a collarmounted on said tie eleextending therethrough and disposed at sub-- stantially right angles to each other, one of said slots being arranged to receive a part of said element projecting through said collar, and a wedge in the other of said slots for clamping the projecting part of said flexible element to said. tool, said tool being adapted to be fulcrumed on said collar for pulling said element relative to said collar.

Y 7. A form clamp comprising a collar-having a slot extending therethrough, a flexible tie band extending through said slot, a tool arranged to gri said flexible band and being adapted to be ulcrumed on said collar for pulling said band relative to said collar, and means on said collar arranged to grip said flexible band.

8. A form clamp comprising a collar having a pair of intersecting slots extending therethrough and disposed at substantially right angles to each other, a flexible tie band extending through one of said slots, a detachable tool arranged to grip said flexible band and being adapted to be fulcrumed on said collar arranged to grip said flexible band.

9, A form clamp comprising a collar, a flexible element adapted to embrace the form and having one end secured to said collar, the other end of said element extending through said collar and being adjustable with respect thereto, a detachable tool arranged to grip said other end of said flexible element and being adapted to be fulcrumed on said collar for pulling said other end relative to said collar, and means on said collar arranged to grip said other end.

10. A form clamp comprising a collar having a pair of intersectlng slots extending therethrough and disposed at substantially right angles to each other, a-flexible band adapted to embrace the form and having one end secured to said collar, the other end of said band extending through one of said slots and projecting beyond said collar, a detachable tool arranged to grip the projecting part of said band and being adapted to be fulcrumed on said collar for pulling said other end relative to said collar, and a wedge in the other of said slots for clamping said other end of said band to said collar.

Signed at Chicago this 2 day of Feb.

GEORGE B. E0800. 

